<template>
  <view>
    <!-- 使用自定义搜索组件 -->
    <!-- <my-search :bgcolor="'black'" :radius="3"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh+'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" class="right-scroll-view" :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 动态渲染三级分类列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的Item项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
      
      
    </view>
  </view>
</template>

<script >
 import badgeMix from '@/mixins/tabbar-badge.js'
 
 export default {
   mixins: [badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        //分类数据列表
        cateList: [],
        active: 0,
        //二级分类列表
        cateLevel2: [],
        // 滚动条距离顶部的距离
        scrollTop: 0,
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      // console.log(sysInfo.windowHeight)
      this.getCateList()
    },
    methods: {
      //获取分类数据
      async getCateList(){
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        // console.log(res)
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // console.log(this.cateList)
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
        // console.log(this.cateLevel2)
      },
      //左侧滑动区域点击事件,选中项改变的事件处理函数
      activeChanged(i){
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        //让scrollTop值在0和1之间切换
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 点击三级分类跳转到商品列表页面
      gotoGoodsList(item3){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
        // console.log('ok')
      },
    },
    
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
      width: 120px;
      .left-scroll-view-item{
        background-color: #f7f7f7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        &.active{
          background-color: #FFFFFF;
          position: relative;
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
    .right-scroll-view{
      background-color: #FFFFFF;
    }
    
  }
  
  .cate-lv2-title{
    padding: 15px 0;
    text-align: center;
    font-size: 12px;
    font-weight: bold;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      width: 33.33%;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
      
    }
  }
  


</style>
